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no. 624,252. Pateted may 2, |899.

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WABP STOP MOTION FUR LUOMS.

(Applicatiun led D ec. 22, 1898.)

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Pate-nted May 2. |899.

E. A. ROBINSON &. V. PIRN.

WABP STOI` MOTIN4 FOB LOOMS.

(Application Bled Dec. 22, 1898.)

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Patented May 2, 1899.

WARP STOP MOTION FOR LOONIS.

(Application led Dec. 22, 1898.)

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. UNITED STATESV PATENT OFFICE.

Vlength of the warp-threads.

EDWIN A. ROBINSON AND VICTOR PIRON, OF LOVELL, MASSACHUSETTS;

' SAID PIRON ASSIGNOR TOSAID ROBINSON.

WRP STOP-MOTION FOR LOONlS.

' SPECIFICATION forming part of Letters Patent No, 624,252, dated May 2, 1899;

I Application led December 22, 1898. Serial No. 699,982. (No model.)

To a/ZZ when@ it may' concern.-

Be it known that we, EDWIN A. 'ROBINSON and VICTOR PIEoN, citizens of the United States, residing at Lowell, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Warp Stop-Motions for Looms, of which the following is a specification, refer-Y ence being had therein to the accompanying drawings.

The -invention relates to warp stop-motions for looms, and more especially to that class of Warp stop-motions in which the detectors or drop-wires are arranged to coperate with those portions of the warp-threads which are moved or spread apart by the harness-fram es in the operation of forming the shed for the reception of the weft-thread. In warp stopmotions of this class the rise of the warpthreads which are lifted for a given shed formation moves the said detectors or dropwires out of the path of the vibrator or feeler. In practice in a loom which is in operation at the customary high rate of speedthe rapid upward and downward movements of the warp-threads set up a continuous and excessive lateral swaying or swinging in the detectors or drop-wires, this swaying or swinging being in a direction at right angles to the The upper ends of the detectors or drop-wires fall or sway over irst toward one side of the loom and then over toward the other side thereof as the sheds successively are formed inthe warpthreads. All of the deteotorsor drop-wires do not sway or swing in the same direction, for at each shed formation `some thereof sway or swing toward the right, while others sway or swing toward the left. This lateral swing or vibration of the detectors or drop-wires is undesirable and objectionable. It tends to occasion unnecessary wear of the warpthreads.- It interferes with the sensitiveness and proper working of the detectors or dropwires. It operates sometimes to prevent prompt engagement of the vibrator or feeler with the Vdetector or drop-wire that corresponds with a broken or slack thread in consequence of swinging the lower end of such detector or drop-wire above the reach ot' the vibrator or feeler. f

The aim of our invention is to suppress and prevent tendency to lateral swing or vibra'- tion of the detectors or drop-wires which has been referred to above. 1

The invention consists in a simple means of attaining this result, as now will be described with reference to the accom panying'd rawings, in which latter we have represented one embodiment of the invention and the application of the same to one well-known form of warp stop-motion for looms.

In the drawings, Figure l shows in vertical section on a plane extending from front to rear in the loom certain portions of an ordinary plain loom with the said embodiment of our invention applied thereto. Fig. 2 is a view showing some of the parts of Fig. l in rear elevation on an enlarged scale. Fig. 3

is a detail View, in side elevation, on the saine enlarged scale as Fig. 2. Fig. 4 shows in rear elevation the harnesses, part of the frame of a loom, and a series of detectors or drop-wires, this iigure being intended to illustrate the lateral swaying or swinging of the detectors or drop-wiresto which reference has been made. the guide-blocks to which reference is made hereinafter. Fig. (3 shows an edge view of the said guide-block. Fig. 7 is a view of a modification employing springs.

In the drawings, l designates the loomframe.

2 is the lay. 3 3 are the harnesses. In practice the lay and harnesses are arranged, mounted, and operated in customary manner, not necessary to be described herein.

4 is the usual shipper-handle. r

5 5 designate the warp-threads, and 6 the woven cloth.

7 is the reed.

S 8 designate the detectors or drop-wires, the same being represented herein as of customary form-namely, composed of fiat strips of sheet metaleach detector or drop-wire having an upper slot 8l and a lower slot S2.

9 and lO 10 are rods which are employed in connection with the detectors or drop-wiresI 8 8 for the purpose of holding the latterin proper position. The opposite ends of these rods9 and l0 10 are connected with brackets Fig. 5 shows in side elevation one of' foo 11, thatare attached to the side frames vof the loom. (See Figs. 1 and 2.) The .detectors or drop-wires 8 8 are strung on the rod 9, the

latter passing through the upper slot 81 ofV each detector or drop-wire. The said rod limits the extent of the vertical movement of case of breakage or absence of the warpthreads.

The rods 10 10 are located on opposite sides of the lower ends of the detectors J or drop-wires and serve to guide the said ends between them. The arrangement of parts just described is well known and at present in use.

12 designates the vibrator or feeler, it being carried by arms 13, which are fast on the shaft 14. The said shaft vis supported in bearings 141, which are provided on the bracket 11, the engaging portion or blade of the vi- -brator or feeler being arranged to move in a path immediately below the guide-rods 1() 10 for vthe lower ends of the detectors or dropwdres. The vibrator is shown herein as operated by means of an arm 15, projecting from one of the lay-swords and-having a lateraily-projecting portion or pin which enters :the slot 16,'that vis formed in the lower end of the rod 17, the latter bei-ng weighted, as at 18,

and the upper end thereof being pivoted to the .arm 19, which is made fastupon the shaft 14 Jof the vibrator or feeler 12, all being snbstantially as in United States Patent to O.

Piper, No. 594,213, gran ted November 23,1897,

-to VAwhich reference may be had. vibrator or feeler is retracted in a positive Thus the l .manner at each forward movement of the lay throughtheaction of the devices which have f just been described, while as the lay swings Abackward the vibrator or feeler is advanced g to ffeel for aA dropped detector or drop-wire through the action of the weight 18, as will be obvious.

counter a dropped detector or drop-wire (see Fig. 1) it will be arrested thereby and prevented vfrom completing its advance. This arrest of the advancing movement of the vithe stoppage of the loom in suitable manner.

As will be understood, sho-uldj` ythe warp-threads. As eaohshed is formed 'the vibrator or feeler, 12 in its advance en-j We have shown herein devices by means of which in the case of the arrest of the advancing movement of theA vibrator or feeler the shipper-handle 4 is dislodged yfromits usualf or .drop-.Wires and of vthe `devices coperathoflding-notch. Thus an arm 20 is fastened on l' the shaft 14 of the vibrator or feeler 12. A pin slide-rod 26 is `connected to one arm of abell-` crank 28,the other arm of which makes contact with the shipper-handle 4. A bunter 29 is mounted on the lay. As will be obvious, the

The bar 23 is pivotdog 24 `is operated from the shaft 14 of the vibrator orfeeler 12, so -as gto riseand fall in unison with the movements of the vibrator or feeler.- In case the vibrator or feeler should be arrested in its advancing movement in consequence of encountering a detector or drop-wire which has been permitted to descend intoV its path through the breaking or slackening of a warp-thread that is passed through the slot 82 of such detector or dropwire then the dog 24 willremain upheld in the path of movement of the bunter 29. In the next backward movement of the lay the said bunter will encounter the said dog and force the vslide-rod 26 rearwardly, thereby turning the bell-crank 28 and dislodging the shipper-handle 4. 'The devices thus far described are of old and known character.

We have referred hereinbefore to the lateral swaying or swinging of the detectors or drop-wires that is occasioned by the rise and f all of the warp-threadsas-they are shed. An attempt ,to illustrate approximatelygthe positions of the detectors or drop-wires thatis assu med by them at a particular instant in the working ot' the loom is made in Fig. 4 of the drawings. lThedetectors ordrop-wi-res on the formation of each shed are caused to assu-me a variety of angular positions, some inclinin g in one direction andsome in the other, while the angle of inclination varies, as will beperceived on reference to Fig. 4. The positions of the detectors or .drop-wires ,alter at -,each successive shed formation. In order to restrain lthe detectors or drop-wires and prevent the swaying or vibration in question,

we combine therewith means of `placingithem under a slight degree of Vtension as they are being lifted. Thus in y:the present lembodiment of the invention we thread through the lower slots 82 .of the .detectors or drop-wires a rod y31, this rod passing entirely beneath the detectors or drop-wires vwhich are being raised by the ascending warp-threads take bearing by the lower ends of their loops 82. againstthe under side of 1therod 31 andcarr-y the latter with them a short distance. brator or feeleris made operative to occasion use vof this rod 31 has in practice yielded eX- `cellent results.

The

It holds the ydetectors or drop-wires perfectly ysteady in their proper vertical position, and it :does not in the least interfere with lthe Yworking of the detectors connected with the fixed screw-hook 353,

IOO

624,252 Y i s standing out from the block.. We find it convenient to employ blocks, as 32, at the opposite ends of the series of detectors or dropwires. One of these blocks is shown separately in Figs. 5 and 6. v Herein the blocks are shown supported by fitting them to the rods 9 and 10 10, the upper extremity of each block being slotted vertically, as at 33, to receive the upper rod 9, while the lower extremity thereof is slotted, as at 34, to iit upon one of the rods 10. These blocks 32 32 prevent endwise movement' of the rod 31, and they also Voperate to steady and holdin position the dotectors or drop-wires at the ends of the series of the latter. Each block 32 is grooved vertically, as at 35, on its inner face to receive the corresponding end ot" the rod l31. The lower end of this groove operates to limit the descent of the rod 31. A bit of -soft packing 36 may be placed in the upper end of the groove in order` to cushion the blow ot the rod 31 against the upper end of the groove 35.

The hereinabove-described lateral swaying of the detectors or drop-wires acts to throw the lower ends of the latter upward more or less relatively to the path of movement of the vibrator 12, as will be apparent from Fig. 4. In Athis iigure the lower ends of the series of detectors or drop-wires will be seen disposed in a more or less sinuous or wavy line. Hence it will be apparent that under some conditions the lower end of a detector or dropwire corresponding with a broken or slackened warp-thread may be turned or swung upward sufficiently with relation to the path of movement of the vibrator to prevent the said vibrator from engaging with such detector or drop-wire. This will interfere with the prompt stopping of the loom. Our invention prevents this from happening.

We claim as our invention- 1. In a warp stop-motion for looms, the combination with the harnesses, and the series ot detectors or drop-wires provided with Y slots strung upon the warp-threads and moved by the latter as they are shed, of the independently-movable rod 31 passing through said slots in the said detectors or drop-wires, raised by the latter, and operating to steady the said detectors or drop-wires through engagement with the lower ends of the said slots, substantially as described.

2. In a warp stop-.motion for looms, the combination with the harnesses, and the series of detectors or drop-wires provided with slots strun g upon the warp-threads and moved by the latter as they are shed, of the independently-movable rod 3l passing through said slots in the said detectors or drop-wires, raised by the latter and operating to steady the said detectors or drop-wires through en gagement with the lower ends of'the said slots, and the blocks 32 at the ends of theseries of detectors or drop-wires, substantially as described.

3. The combination with a series of detectors coacting with the Warp-threadsina loom and provided with slots,ot` the independentlymovable gravitating rod 31 passing through said slots, supported by the lower ends thereof, and raised by the detectors as they ascend, substantially as described.

In testimony whereof we affix our-signaL tures in presence of two-witnesses.

EDWIN A. ROBINSON. VICTOR PIRON. 

